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Finding the Fourth Proportional to 586.54, 809.85 and 390.46

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Solution

The fourth proportional to 586.54, 809.85 and 390.46 is: 539.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.54 : 809.85 = 390.46 : x
  2. Step 2: Convert to fraction form
    586.54/809.85 = 390.46/x
  3. Step 3: Cross multiply
    586.54x = 809.85 × 390.46
  4. Step 4: Simplify right side
    586.54x = 316,214.03
  5. Step 5: Solve for x
    x = 316,214.03/586.54
  6. Step 6: Final answer
    x = 539.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.